Beds composed of nuts! (6)

I believe the answer is:

futons

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'beds' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe you can see an association between them that I can't see?

'composed of nuts' is the wordplay.
'composed' is an anagram indicator.
'of'+'nuts'='ofnuts'
'ofnuts' anagrammed gives 'FUTONS'.

Can you help me to learn more?

(Other definitions for futons that I've seen before include "Japanese padded quilts" , "Japanese mattresses on the floor" , "Mattresses for the floor in Japan" .)

I've seen this clue in the Sydney Morning Herald.

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